| # This tests the internal _objects attribute |
| import unittest |
| from ctypes import * |
| from sys import getrefcount as grc |
| |
| # XXX This test must be reviewed for correctness!!! |
| |
| """ |
| ctypes' types are container types. |
| |
| They have an internal memory block, which only consists of some bytes, |
| but it has to keep references to other objects as well. This is not |
| really needed for trivial C types like int or char, but it is important |
| for aggregate types like strings or pointers in particular. |
| |
| What about pointers? |
| |
| """ |
| |
| class ObjectsTestCase(unittest.TestCase): |
| def assertSame(self, a, b): |
| self.assertEqual(id(a), id(b)) |
| |
| def test_ints(self): |
| i = 42000123 |
| refcnt = grc(i) |
| ci = c_int(i) |
| self.assertEqual(refcnt, grc(i)) |
| self.assertEqual(ci._objects, None) |
| |
| def test_c_char_p(self): |
| s = "Hello, World" |
| refcnt = grc(s) |
| cs = c_char_p(s) |
| self.assertEqual(refcnt + 1, grc(s)) |
| self.assertSame(cs._objects, s) |
| |
| def test_simple_struct(self): |
| class X(Structure): |
| _fields_ = [("a", c_int), ("b", c_int)] |
| |
| a = 421234 |
| b = 421235 |
| x = X() |
| self.assertEqual(x._objects, None) |
| x.a = a |
| x.b = b |
| self.assertEqual(x._objects, None) |
| |
| def test_embedded_structs(self): |
| class X(Structure): |
| _fields_ = [("a", c_int), ("b", c_int)] |
| |
| class Y(Structure): |
| _fields_ = [("x", X), ("y", X)] |
| |
| y = Y() |
| self.assertEqual(y._objects, None) |
| |
| x1, x2 = X(), X() |
| y.x, y.y = x1, x2 |
| self.assertEqual(y._objects, {"0": {}, "1": {}}) |
| x1.a, x2.b = 42, 93 |
| self.assertEqual(y._objects, {"0": {}, "1": {}}) |
| |
| def test_xxx(self): |
| class X(Structure): |
| _fields_ = [("a", c_char_p), ("b", c_char_p)] |
| |
| class Y(Structure): |
| _fields_ = [("x", X), ("y", X)] |
| |
| s1 = "Hello, World" |
| s2 = "Hallo, Welt" |
| |
| x = X() |
| x.a = s1 |
| x.b = s2 |
| self.assertEqual(x._objects, {"0": s1, "1": s2}) |
| |
| y = Y() |
| y.x = x |
| self.assertEqual(y._objects, {"0": {"0": s1, "1": s2}}) |
| ## x = y.x |
| ## del y |
| ## print x._b_base_._objects |
| |
| def test_ptr_struct(self): |
| class X(Structure): |
| _fields_ = [("data", POINTER(c_int))] |
| |
| A = c_int*4 |
| a = A(11, 22, 33, 44) |
| self.assertEqual(a._objects, None) |
| |
| x = X() |
| x.data = a |
| ##XXX print x._objects |
| ##XXX print x.data[0] |
| ##XXX print x.data._objects |
| |
| if __name__ == '__main__': |
| unittest.main() |